Carburetor throttle valve with fuel re-sprayer

ABSTRACT

A throttle valve for a carburetor and a carburetor incorporating such a valve, the throttle valve comprising a disc, diametrically extending support shafts rigidly attached to the disc and dividing the disc into two halves, a semi-circular shell belt attached to one half of the disc adjacent the periphery of the disc and extending in a direction substantially normal to one surface of the disc and a plurality of teeth arranged in a semicircle adjacent the belt on the side of the belt remote from the periphery of the disc, the teeth being attached to and extending from said surface, curved in a plane parallel to said surface with the inside of the curve facing the center of the disc and being spaced by V-shaped notches.

' [22] Filed:

[ Oct. 21, 1975 CARBURETOR THROTTLE VALVE WITH FUEL RE- SPRAYER [75] Inventor: An Sang-Yo], Seoul, South Korea [73] Assignee: Hyundai Motor Company, Seoul,

South Korea 'July 9, 1974 211 App]. No.: 486,797

[30] 7 Foreign Application Priority [Data 1,233,027 5/1960 France 261/65 Primary Examiner-Tim R. Miles Attorney, Agent, or FirmLadas, Parry, Von Gehr, Goldsmith & Deschamps 57] ABSTRACT A throttle valve for a carburetor and a carburetor incorporating such a valve, the throttle valve comprising a disc, diametrically extending support shafts rigidly attached to the disc and dividing the disc into two halves, a semi-circular shell belt attached to one half of the disc adjacent the periphery of the disc and extending in a direction substantially normal to one surface of the disc and a plurality of teeth arranged in a semi-circle adjacent the belt on the side of the belt remote from the periphery of the disc, the teeth being attached to and extending from said surface, curved in a plane parallel to said surface with the inside of the curve facing the center of the disc and being spaced by V-shaped notches.

8 Claims, 3 Drawing Figures Patent Oct. 21, 1975 Sheet10f2 $914,350

US. Patent Oct. 21, 1975 Sheet 2 of2 3,914,350

CARBURETOR THROTTLE VALVE WITH FUEL:

. RE-SPRAYER This invention relates to a/throttle valve arranged to re-spray droplets of fuel congealed when the fuel spray from the main jet of a carburetor strikes the throttle valve. j. t

In the conventional carburetor having a conventional throttle valve, part of the .fuel which is discharged from the main jet as a fine spray strikes the throttle valve disc and is congealed into droplets which are discharged from the edge ot'the discinto the engine. 'llhese droplets frequently do not break up into .a fine dispersion which will mix properly with the inducted airwith the consequent result that combustion is incomplete.

One approach to the solution of this problem is dis? closed in Pat. No. 3,298,677, in accordance with which a carburetor has, a throttle valve with a plurality of spacedapart notches extending from a notched edge of the throttle valve and terminating prior to reach in the center of the valve, thereby to provide air passage for communicating gases toward the center of the air/fuel flow through the carburetor to facilitate desired breaking up of droplets formed on the throttle valve into a fine spray and mixing of the spray with air for combustion.

An object to the present invention is to provide improved dispersion of droplets of fuel from the edge of a throttle valve.

According to the invention there is provided a throttle valve for a carburetor comprising a disc, diametrically extendingsupport shafts rigidly attached to the disc and dividing the disc into two halves, a semicircular shell belt attached to one half of the disc adjacent the periphery of the disc and extending in a direction substantially normal to one surface of the disc and a plurality of teeth arranged in a semi-circle adjacent the belt on the side of the belt remote from the periphery of the disc, the teeth being attached to and extending from said surface, curved in a plane parallel to said surface with the inside of the curve facing the center of the disc and being spaced by V-shaped notches.

By the use of the plurality of teeth projecting upwardly at intervals, droplets of fuel formed while striking the throttle are caused to flow between the teeth and onto the edge of the shell belt to be sprayed there from in a finally dispersed spray by the action of and from mixing with the passing air. The arrangement of the present invention provides fine dispersion of the aforementioned droplets of fuel and facilitates complete combustion with a consequent reduction in pollution levels resulting from the combustion process.

from diametrically opposite points of which are pivot and operating shafts 5. The shafts 5 extend diametrically with respect to the center of the disc and 'in the carburetor are pivotally mounted in bores diametrically positioned in the housing of the carburetor with one of the shafts extending through the housing for connection to a throttle valve operating linkage.

The disc 4 has an upwardly facing surface 6 which when the disc is mounted in the carburetor 1 faces the main nozzle assembly and this upwardly facing surface 6 is divided by the pivotal axis of the shafts 5 into an upstream half 7 and a downstream half 8, the downstream'half 8 being arranged to move in the direction of air/fuel mixture flow through the carburetor as the throttle valve is moved from a closed to an open position.

Adjacent the periphery of the downstream half 8 of the disc 4 on the surface 6 and projecting in a direction normal to the surface 6 is a semi-circular shell belt 9. The shell belt 9 is in the form of a fence of constant height which is angled inwardly toward the axis of the throttle valve and which terminates at its rim ina sharp edge. Immediately inside the shell belt 9 is a semicircular row of teeth 10, the teeth extend in a direction generally normal to the surface 6 and are spaced apart by V-shaped notches 11 with the base of the V approxi mately level with the top of the shell belt 9 when considered in a plane parallel to the plane of surface 6 and the open end of the V being coincident with the tip of the teeth 10. r

The teeth 10 are angled inwardly toward the central axis of the disc 4 and in a plane parallel to the surface 6 are slightly curved with the inner curved face facing the central axis of the disc 4. The curve of the teeth 10 decreases in radius from the base of the teeth to the tip thereof. L

Inoperation, with the throttle mounted in carburetor l, the main nozzle assembly dispenses a fine dispersion of fuel for mixing with air passingthrough the venturi tube 2. Some of this fine dispersion of fuel strikes the surface 6 of the disc 4 and forms undesirably large An embodiment of the invention will now be deshown in FIG. 1.

In the drawings, a conventional carburetor 1 has a venturi tube 2 in which is housed a main nozzle (not shown). Disposed below the main nozzle in the venturi tube 2 is a pivotally mounted throttle valve 3. The

throttle valve 3 comprises a circular disc, extending droplets of fuel on that surface. The droplets .are caused by the air flow over the valve to run toward the semi-circular row of teeth 10 and, upon reaching this row of teeth, to pass through the notches l l to the shell belt 9 from the rim of which air flow past the disc 4 carriesthe fuel in a fine dispersion for mixing with that air to form a desirable mixture for complete combustion. Air flowing over the surface 6 passes through the notches 11 between the teeth 10 and in so doing carries the droplets of fuelformed on the surface 6 through the notches which by virtue of their V-shape break up the droplets in order that the air'passing over the shell belt 9 will produce a finely dispersed spray from the already broken droplets thereby to facilitate desirable mixing of the air and fuel to produce a fully combustible mixture. I

I claim:

1. A throttle valve for a carburetor comprising a disc,

diametrically extending support shafts rigidly attached to the disc and dividing the disc into two halves, a semicircular shell belt attached to one half of the disc adjacent the periphery of the disc and extending in a direction substantially normal to one surface of the disc and a plurality of teeth arranged in a semi-circle adjacent the belt on the side of the belt remote from the periphery of the disc, the teeth being attached to and extending from said surface, curved in a plane parallel to said surface with the inside of the curve facng the center of the disc and being spaced by V-shaped notches.

2. A throttle valve according to claim 1, wherein said belt is angled toward the center of the disc and terminates in a direction normal to the surface of the disc in a sharp edge.

3. A throttle valve according to claim 2, wherein said teeth are angled inwardly toward the center of said disc and the bottom of said V-shaped notches lie in a plane parallel to said surface and in which the sharp edge of said belt lies.

4. A throttle valve according to claim 3, wherein said curvature of said teeth increases in radius toward said surface.

5. A carburetor incorporating a throttle valve comprising a disc, diametrically extending support shafts rigidly attached to the disc and dividing the disc into two halves, a semi-circular shell belt attached to one half of the disc adjacent the periphery of the disc and extending in a direction substantially normal to one surface of the disc and a plurality of teeth arranged in a semi-circle adjacent the belt on the side of the belt remote from the periphery of the disc, the teeth being attached to and extending from said surface, curved in a plane parallel to the plane of said surface with the in side of the curve facing the center of the disc and being spaced by V-shaped notches.

6. A carburetor according to claim 5, wherein said belt is angled toward the center of the disc and terminates in a direction normal to the surface of the disc in a sharp edge.

7. A carburetor according to claim 6, wherein said teeth are angled inwardly toward the center of said disc and the bottom of said V-shaped notches lie in a plane parallel to said surface and in which the sharp edge of said belt lies.

8. a carburetor according to claim 7, wherein said curvature of said teeth increases in radius toward said surface. 

1. A THROTTLE VALVE FOR A CARBURATOR COMPRISING A DISC, DIAMETRICALLY EXTENDING SUPPORT SHAFS RIGIDLY ATTACHED TO THE DISC AND DIVIDING THE DISC INTO TWO HALVES, A SEMICIRCULAR SHELL BELT ATTACHED TO ONE HALF OF THE DISC ADJACENT THE PERIPHERY OF THE DISC AND EXTENDNG IN A DIRECTION SUBSTANTIALLY NORMAL TO ONE SURFACE OF THE DISC AND A PLURALITY OF TEETH ARANGED IN A SEMICIRCLE ADJACENT THE BELT ON THE SIDE OF THE BELT REMOTE FROM THE PERIPHERY OF THE DISC, THE TEETH BEING ATTACHED TO AND EXTENDING FROM SAID SURFACE, CURFED IN A PLANE PARALLEL TO SAID SURFACE WITH THE INSIDE OF THE CURVE FACING THE CENTER OF THE DISC AND BEING SPACED BY V-SHPED NOTCHES.
 2. A throttle valve according to claim 1, wherein said belt is angled toward the center of the disc and terminates in a direction normal to the surface of the disc in a sharp edge.
 3. A throttle valve according to claim 2, wherein said teeth are angled inwardly toward the center of said disc and the bottom of said V-shaped notches lie in a plane parallel to said surface and in which the sharp edge of said belt lies.
 4. A throttle valve according to claim 3, wherein said curvature of said teeth increases in radius toward said surface.
 5. A carburetor incorporating a throttle valve comprising a disc, diametrically extending support shafts rigidly attached to the disc and dividing the disc into two halves, a semi-circular shell belt attached to one half of the disc adjacent the periphery of the disc and extending in a direction substantially normal to one surface of the disc and a plurality of teeth arranged in a semi-circle adjacent the belt on the side of the belt remote from the periphery of the disc, the teeth being attached to and extending from said surface, curved in a plane parallel to the plane of said surface with the inside of the curve facing the center of the disc and being spaced by V-shaped notches.
 6. A carburetor according to claim 5, wherein said belt is angled toward the center of the disc and terminates in a direction normal to the surface of the disc in a sharp edge.
 7. A carburetor according to claim 6, wherein said teeth are angled inwardly toward the center of said disc and the bottom of said V-shaped notches lie in a plane parallel to said surface and in which the sharp edge of said belt lies.
 8. a carburetor according to claim 7, wherein said curvature of said teeth increases in radius toward said surface. 